Device for jointing saws



(Model) -E. PRESTON v DEVICE FOR JOINTING SAWS No. 253,555. P5555555 Feb. 14,1882.

WITNESSES fiMAaM UNITED STATES PATENT OFFICE.

EDWARD PRESTON, OF WINONA, MINNESOTA.

DEVICE For: JOINTIING SAWS.

SPECIFICATION forming part of Letters Patent No. 253,555, dated February 14, 1882.

Application filed October 1, 1881. (Model) To all whom it may concern:

Be it known that I, EDWARD PRESTON, of Winona, in the county of Winona and State of Minnesota, have invented certain new and use- I ful Improvements-in Side-Jointers and Sharpeners for Gang-Saws; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawings, which form a part of this specification.

Thisinvention relates to a device for facilitating the side-jointing and sharpening of the swaged or spread-out points of gang-saw teeth.

The object of the invention is to provide the device with adjustable and yielding file-blades which will readily conform to the shape of the teeth, and also to provide certain improved details of construction, as hereinafter described, and illustrated in thedrawings, in which- Figure 1 is a side elevation, with a section of the saw-blade held-therein by the spring clamp-plates. Fig. 2 is an end view. Fig. 3 is a horizontal section taken on a planejust above the adjustable screws.

A indicates the file-holder, which consists of a flat plate, a, with the upturned sides a a,

' which converge toward their upper edges.

B B are two file-plates arrangedlongitudinally within the holderaud converging toward their upper edges.

C indicates an intermediate plate, having its upper edge formed with file-teeth. This plate 0 is arranged between the two inclined file-plates, with its upper edge somewhat lower than the upper edges of the inclined plates, thus forming achannel with serrated sides and bottom. The inclined file-plates B are secured in the recessed upper ends of small bearing blocks or brackets D, which are pivoted. at their lower ends to the inner ends of set-screws E, arranged to pass through the inclined sides between the outer inclined file-plates and the inclined sides of the holder.

H H are the spring. clamps or jaws, which extend upwardly from theinclined sides of the holder and normally stand in a closed position. The saw-blade, with its teeth spread out or swaged at their points, as at h, Fig. 2, is

inserted between the spring-jaws, whereby the device will be held and guided upon the sawblade. The pivoted inclined file'plates adapt themselves to the teeth points, while the springs serve to hold the said plates against the sides of the teeth, in order that as the device is drawn along the saw the teeth will he jointed or sharpened and the proper inclination of their sides maintained. The upper edge of the intermediate tile-plate will during such operation effectively sharpen the points or lower edges of the teeth. It will be observed that all of these file-plates can be adjusted to suit different saws by adjusting the set-screws, and that upon the set-screws holding the inclined plates I arrange springs I between the recessed pivoted brackets and the sides of the holder A. These springs can take the place of the half-elliptic springs, if desired.

Having thus described my invention, wha I claim is- 1. The combination, with the file-holder, ot' the inclined files, supported by pivoted 'adjustable bearings, and the intermediate file,

arranged 'to be adjusted vertically between the 

